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As we all know, the COVID-19 outbreak hit the world and changed our lifestyle. In this condition, Alcohol and hand sanitizers are vital fluids, however, they must be used properly. Touching alcohol containers or hand sanitizers with infected hands can spread the virus to the next person. In this article, we will build an automatic hand sanitizer dispenser that uses IR sensors to detect the presence of a hand and activates a pump to pour the liquid on the hand. The intention was to find the cheapest and easiest solution and design a circuit. Therefore no Microcontroller or Arduino has been used. Two designs have been introduced and you are free to select and build any of them. The first design uses SMD components and the second design is even simpler. It uses DIP components on a small single layer PCB board.
References
Article: https://www.pcbway.com/blog/technology/DIY_Automatic_Hand_Sanitizer_Dispenser__without_Arduino_or_MCU.html
[1]: AMS1117-5.0 Datasheet: http://www.advanced-monolithic.com/pdf/ds1117.pdf
[2]: LM555 Datasheet: http://www.ti.com/lit/ds/symlink/lm555.pdf?&ts=1589508422474
[3]: TSOP1738 Datasheet: https://eu.mouser.com/datasheet/2/427/introductionpartnumbers-1766653.pdf
[4]: NDS356 Datasheet: https://eu.mouser.com/datasheet/2/308/NDS356AP-D-1813031.pdf
[5]: AMS1117-5.0 Schematic Symbol and PCB Footprint: https://componentsearchengine.com/part.php?partID=2376678
[6]: LM555 Schematic Symbol and PCB Footprint: https://componentsearchengine.com/part.php?partID=380204
[7]: TSOP1738 Schematic Symbol and PCB Footprint: https://componentsearchengine.com/part.php?partID=1116997
[8]: NDS356 Schematic Symbol and PCB Footprint: https://componentsearchengine.com/part.php?partID=840198
[9]: CAD Plugins: https://www.samacsys.com/library-loader-help
[10]: LM393 Datasheet: http://www.ti.com/lit/ds/symlink/lm393-n.pdf?&ts=1589509317025
[11]: BD140 Datasheet: https://www.mouser.com/datasheet/2/149/BD140-888626.pdf
[12]: LM393 Schematic Symbol and PCB Footprint: https://componentsearchengine.com/part.php?partID=298790
[13]: BD140 Schematic Symbol and PCB Footprint: https://componentsearchengine.com/part.php?partID=166782